Bicycle MechanicsBroken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

I have a Schwinn mountain bike and the Shimano rear derailleur broke. Its a Shimano Tourney with SIS Index, whatever that means, and my shifter is a Shimano revoshift. I'd like to upgrade the rear derailleur, but dont know how to tell if some of the better ones are compatible. Can someone help please?

Rapid rise should also work fine, no? Or do the cogs need to be of the heavily ramped and profiled variety?

THe best value for you money is going to be an Alivio or similar. Acera is about the cheapest I would consider buying, and unless the bike is fancy, Deore works as well as the higher end ones when properly set up.

Check out the Microshift model 56 sold under the Nashbar label. I paid about $23 after 25% off coupon. Can easily handle 32T cog. Quality is between Shimano 105 and Ultegra. It's rated for 10 speed operation. All metal construction.